This morning it started up a little rich ~12.0 for the first 15 seconds but slowly crept up to 14.7 until close loop kicked in about 30 seconds later. Overall I consider this a success. Go figure...

There are differences in my MAF table this time around down low. So to those with startup issues you need to find a balance between K and MAF values in the low voltage areas. Do a log of your cold startup next time around and we should be able to see where your MAF needs adjustment.

 

I;ll try this within the next few days.

 

I took it a step further and tuned my cold startup, idle and low load by MAF only with all fuel comp at 100.

For example, if it logged a correction of 120 at 1.4 volt I would multiply the MAF values in the 1.4 volt area by 1.2. Rinse, wash and repeat for every voltage value the startup and warmup hit, took about 3-4 flashes.

Then I drove around and logged low-medium load and did the same thing. About 5 flashes and the car is within +/- 10% at every load cell I could hit out of boost with all comp values at 100.

Overall compared to the stock PMAS values it looks like I subtracted from lower voltage areas, and added to higher voltage areas.

Static Values:

K: 37120
ILA: 135
ILS: 123
IMEPW: 1.5ms

I notice my values are pretty off from what Vince recommended. However my values were created using the scaling tool and the latency values provided directly from DW for 440-600cc.

Let's see if cold startup becomes an issue in the morning

 

Holy **** it started up perfect this morning...just like stock. A/F slowly crept from 11.0 to 14.7 then closed loop kicked in and was pulling about 10% fuel constant. Once the car is fully warmed up it pulls/adds +/- 5%. Keep in mind this is with the entire fuel map at 100!

 

Cool...I'm off Sunday so I'll see if I can play with that on Sunday.

 

Make sure you've got these values too:

ILA: 135
ILS: 123
IMEPW: 1.5ms

Those three values are the same between 440 and 600cc DW. Seems like a K ~40,000 is where you want to be according to Vince and my own values.

 

I am taking it these values are in decimal format?

Also what MAF Map you running. Is it the the Default for the PMAS setup from Osiris, then you made your adjustment from there? Flash, adjust Flash?
Also what do your Cranking enrichment values look like now?

By the way thanks for sharing this info. It' a Big help to a few of us out here.

 

Those should be decimal values. It is what is taken from the same screenshot you posted; you should just be able to enter them in.

I worked off the PMAS curve. flash, log startup, analyze log, adjust, repeat...

I did not mess with any cranking enrichment or timing values... just worked on the MAF with entire fuel table set to 100%.

 

Cold start vid

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These are the vavues i got from DW for the 440 and 600cc injectors

They are 6v-17v in 1v increments, measured in ms

Latency MS. 3.57 2.87 2.42 2.10 1.88 1.71 1.59 1.47 1.35 1.27 1.19 1.12

When u use the ILA u cant get them exactly to match but u can get them close

Thats where i got my values from. I have seem maps come through with those values still at stock settings and the cars still seem to start and idle good when u have the MAF values and the K fuel Multiplier set up right....so im not sure how critical they need to be to be exact...

looks like you guys are gettin things figured out a lil...

 

You can get it real close from 10-14v which is all that really matters.

I found that by not changing the injector values from stock it will work but you will have slightly rougher idle and decel. It drives way more like stock with the correct values. The other thing is that if you change them you pretty much have to redo the whole tune, so do it 1st not last!! LOL

 

Very nice djamps. Whats your MAF Table look like? I re-did min with these steps.
1 . I re-did the Static Injector values with what you posted.
K: 37120
ILA: 135
ILS: 123
IMEPW: 1.5ms

2. Re-added the PMAS by selecting MAF on the static table and apply.
attached is my MAF Table.

I cannot thank you enough for all your help input. I am still learning and both you (djamps) and Vince are very helpful.
This whole injector scaling/PMAS is new to me.

Chad

 

I don't have my cable on me now so I can't load up the ROM editor and copy the MAF table. But from what I am reading PMAS varies greatly from PMAS to PMAS so you are probably better off starting from the map that Uprev provides. If you follow the procedure I mentioned you should have startup/idle nailed down in 3-4 flashes, and low load driving in another 3-4 flashes. Today I adjusted the MAF in the boost areas (>2.6V on my chart) so my entire fuel comp table is within +/- 5% even in boost. I would even say it drives better than stock now.

Interestingly enough I've found MAF tuning to be easier for street tuning without a dyno because you can do it from just the Cypher logs and rom-editor. Once you get the MAF dialed in everything else just falls in place.

 

+1 this is true...

When my first PMAS died I got a new PMAS but I had to get re-tuned because the original PMAS had different cal values from the new PMAS...